\spˈaθɪfˌɔːm], \spˈaθɪfˌɔːm], \s_p_ˈa_θ_ɪ_f_ˌɔː_m]\
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1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.

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Ultraviolet Ray

  • That portion electromagnetic spectrum immediately below visible range extending into x-ray frequencies. longer near-biotic vital necessary for endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic extravital rays) viricidal, bactericidal, mutagenic, carcinogenic used as disinfectants.
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